[issue18115] Use importlib.util.module_to_load in all loaders in importlib

[Brett Cannon]

Brett Cannon added the comment:

Turns out BuiltinImporter doesn't like having a pre-existing module, so a new keyword argument will be necessary to allow for only the cleanup code to run and not the construction of a new module.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18115>
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